Judson l



(No Model.)

J. L. THOMSON. RIVET.

No. 416,694. Patented Dec. 3, 1889.

4Q! I f moan:

UNITED STATES PATENT OFFI E.

J UDSON L. THOMSON, OF SYRACUSE, NEW YORK, ASSIGNOR TO THE J UDSON L.THOMSON MANUFACTURING COMPANY, OF SAME PLACE.

RIVET.

SPECIFICATION forming part of Letters Patent No. 416,694, dated December3, 1889.

- Application filed June 21, 1889. Serial No. 315,123. (No model.)

To all whom it may concern.-

' Be it known that I, J UDSON L. THOMSON, of Syracuse, in the county ofOnondaga, in the State of New York, have invented new and usefulImprovements in Rivets, of which the following, taken in connection withthe accompanying drawings, is a full, clear, and exact description.

' My invention rela es to an improved. rivet for holding togetherportions of leather, fabric,-and other articles, and has for its objectthe production of a simple and elfective rivet from sheet metal, wherebythe cost of manu- "facture is reduced to a minimum and the I 5 rivet isof suoh-aconstruction as to cause the same to readily enter the desiredarticles; and to this end it consists, essentially, in a blank stampedor otherwise formed of sheet metal and formed with a head and therivetprongs extending therefrom.

In describing my invention referenceishad to the accompanying drawings,forming a part of this specification, in which like letters indicatecorresponding parts in all the views.

2 5 Figure l is an elevation of the blank from which the rivet isformed. Fig. 2 is a plan view illustrating the central portion of the.

Ward. Fig. 5 is an elevation of the rivet,

as shown in Fig. 4. Fig. 6 is a plan of the rivet after the operation ofmanufacturing the same is completed. Fig.7 is an elevation of saidrivet. Fig. 8 is a plan of a modi- 4o fied construction of the rivet,and Fig. 9 is an elevation of said modified construction.

By means of a suit-able stamping or cutting machine I form from sheetmetal the blank A, having the central portion A and the arms 5 Bprojecting therefrom. The portion A and the arms B B are of suitablesize and form,

so that when the operation of constructing the rivet is completed thedesired form of rivet will be produced. The edge aof the portion A ispreferably turned or lapped Fig. 3 represents an elevation of upon themain part of said portion forming the rivet-head a. The preferablemanner of lapping these edges is to depress the central part of theportion A of the blank and cause the edge a to rise upwardly therefrom,as shown in Figs. 2 and 3. The upwardly-extending edge a is then bentdownward and inward, as I illustrated in Figs. 4 and 5. The rivet isthen further operated upon, causing the portion a to lie snugly upon thecentral portion of the rivet-head. The device for forming the sheet:metal rivet in said manner may consist of punches or presses or anydesired construction of machine which will produce the desired result. 65

By reference to the drawings itwill be seen that the arms B, forming theprongs Z), which may be of any desirable shape, are preferably taperedfrom their base to their free extremity, causing the strength of saidprong to grad nally increase toward the head. By lapping inward the edgea over the main portion of the head a it will be observed that this headis thereby greatly stifiened, and when inserting the rivet there is noliability of bending the same. The prongs b by reason of their taperedform will more readily enter articles into which they are inserted, andwhen inserted will be more readily clinched.

. At the extremity of the prong b, I prefer So to form the cutting-edgeb, which may be formed at any desired point in the manufacture of saidrivet, either before the shaping of the rivet-blank or after theoperation of shaping is entirely finished. These cuttingedges I) alsoinsure the easy entrance of the rivet-prongs. I r

By reference to Figs. 4: and 6 it will be ob served that therivet-prongs, which may be of any desirable form, are preferably ofcurv- 9o ing contour. This peculiar shape greatly strengthens therivet-prongs-and prevents the bending of the prongs during the operationof riveting.

As shown in the drawings, the rivet-prongs, being formed of sheet metal,allow the space between them to extend entirely to the head. While I donot limit myself to this particular feature, yet it is one of. greatadvantage, since the prongs extend'through the article riveted IQO V ofthe a sufficient distance so that the head thereof is contacted with thetop of said article, thus producing a fine finish and causing the rivetto project a minimum amount before the article riveted, and preventing acompression riveted article between the rivetprongs at the point wherethey join the head.

. being formed convex, is formed concave. This rivet, While not asdesirable as the preferable construction, still possesses features ofgreat advantage, which render the same useful and efficient in manycases.

The operation of my improved rivet will be readily perceived from theforegoing, and it will be understood that I do not limit myself to themanner in which it shall be construct ed or the precise form andconstruction.

Having thus fully described my invention,

'what I claim as new, and desire to secure by Letters Patent, is

1. The herein-described rivet, formed from sheet metal,'consisting of ahead and prongs projecting therefrom, with a space intervening betweenthe adjacent edges of said prongs, said prongs being tapered widthwisefrom their base to their free extremity, SUbS'C-flll" tially asdescribed.

2. The herein-described rivet, formed from sheet metal, consisting of ahead and prongs projectingtherefrom, with a space intervenin g betweenthe adjacent edges of said prongs, said prongs being taperedwidthwisefrom their base to their free extremity and provided withcutting-edges at said extremities, substantially as specified.

3. The herein-described rivet, formed from sheet metal, consisting of ahead and prongs projecting therefrom, with a space between the adjacentedges of said prongs, said prongs being formed of rounding contour,substantially as and for the purpose described.

4. The herein-described rivet, made from a sheet-metal blank, the saidrivet being composed of a head formed by lapping or bending said blankupon itself, prongs projecting from said head and formed by bendingupward the opposite extremities of said blank, and a space interposedbetween the adjacent edges of said prongs whereby they can be readilyclinched, substantially as and for the purpose specified.

Intestimony whereof I have hereunto signed my name, in the presence oftwo attesting wit,- nesses, at Syracuse, in the county of Onondaga, inthe State of New York, this 15th day of June, 188.).

JUDSON L. THOMSON.

\Vitn esses:

CLARK II. NORTON, A. E. PARSONS.

